Improvement in oabpenters -betfch dog



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E. n. Macon or WINSTED, CONNECTICUT, A ssteNon To HIMSELF AND n. oooK AND SONS, or SAME PLAGE.

Letters ,Patent No.` 77,998, dated May 19, '1868; mttdttted May 4, 1868.

IMPROVEMENT IN otnrrnrrns'rnon Doe.

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.TO ALL WHOM IT MAY CONCERN:-

'13e it known that I, E. B. McCOY, ot' Winsted, in the county of Litehi'ield, and State of Connecticut, have invented n new AImprovement in JoinersgBenehHoolr; and I do hereby declare the following, when taken in connection with thc accompanying drawings, and-the letters of reference-marked thereon, to be a. full, clear and exact description ofthe same, and which saidfdrawings constitute part of this specificatiomandrepresent, in-

Y Figure 1, side vi'ew, and in ,A l

Figure 2 a top view, a portion of the hook broken away, to show the,internal-arrangement.. i

This invention relates to au improvement in 'the hook or stopused byjoiners and other workers in wood'at the head of the hench,and against which the wood te be wrought is set, its object being to adjnst and set the hook at any desired height, accordingr tothe thickness of the wood to be wrought, and'consists in the arrange.;l ment of right and left-hand screws, so that by turning the one the hook will he raised, and the other, the hook will be lowered, and by reversing the movement ofthe screw so turned, when set at the Aproper, height, the hook will be firmly. locked in that position.

To enable others to eonstructand use my improvement, I .will proceed to describe thje same, as illustrated in the accompanying drawings. I Y

A is the filato, which is set and fixed into the bench, and has formed inlits surface a recess, into which the hook B will set ush with the surface of the plate. C is a left-hand screw, and D D right-hand screws, each werking through the plate A, as seeniin g. 1. The centre or leftlhand nscrew issecured to the hook Bgasse'en in tig. 1, but so as to be turned freely in its bearing. The upperends of the other two screws `also hare'bearings in the hook B, asscen in iig, l, and the upper ends of the three screws are slotted, as denoted in 5g. 1, and uponleaeh of the screws are arranged gears e and Z d, so that the three screws are movedtogethen The wheel upon the centre screw is loose upon the screw, so as to permit the screw to beturncd partially nround'without moving the said gear. This is done by forming a groove,f, in the upper surfacebf the centre gear, e, and fxingia pinyz', in the shaft of the screw G, which lies in the said groove, so as tolpermit the turning of' the said Screw within thc limits of the said screw without moving the gear c. f

The operation of the hook Ais as follows: To reise *the hook, place an ordinary screw-driver in the slot of the centre screw, and turn it in the direction to raise the hook; the pin zwillstrike the end of th'c groovcfmnd cause the revolution of the three screws, and the hook will continue to rise so long as the cent1-'e screw is so turned; and when raised to the proper height, reverse the movement of' the'ccntre screw, which turns the said centre screw down, the pin returning in the groovef, the other two screws remaining stationary, and the centre screw drews down and firmly binds the h ook before the pin z'reaehes the other extreme ofthe groovef, nnrl tlius holds it' in the required position.V

To lower the hook, place the Screw-driver in the slot of either et' the other screws D, and turn in the direction to lower the hook, the centre gear communicating motion to the other two screws, the end of the groovef striking end causingthe centre screw to lower. To x the hook in the lowered position, reverse themovement of the screw-driver to turn the screw D inthe opposite direction ;-the centro gear @will turn without moving its screw, and thus the hook will be hound as before; Thus the centre screw forms, as it wcrc,'a jam or binding-` screw.

I I have represented the centre screw as a left-hand, and the two outer screws as rightshand. These may he reversed, and the outer screw be made left-hand, while the centre screw is righthand.

It is not positively necessary that three screws hek cmployed,'as but a single right and a lsingle left, rranged so asto bind together in tho manner described, will accomplish the result, but not in solsatisfaetory a manner l as the three screws. A

Having' thus yfully described my invention, what 'I claim as new and useful, and desire to secure by Letters Patent, isv i' 1 The screw C, arrangedwith its gear c, and combined with one or more screws, D, of reverse threads, so as to operate together, and the one to bind the other, substantially as herein set forth. V 1

E. B. McCOY.

Witnesses:

M. W. DOUGLAS, Jenn Kreatur 

